LG seems to have focused in the appliance business (TV screens, domestic consumer electronics, etc) and they white label 99% of the OLED panels coming off of their assembly line, with some making their way into Samsung TVs. While Samsung has a superior panel for small displays, LG’s focus consumer electronics has given it a small lead in the larger display race. They have better SDK/HDKs, more power efficient screens, and an array of tiers of displays to sell to their customers. If you bought a Sony, Vizio, or Sharp branded TV in the last 5 years, it for sure has an LG display in it. Other brands use LG as well but those three have an exclusive contract.

The dynamics of this business is fascinating.

Apple also used BOE OLEDs (12th and 13th I think?) and the iPhone 12 OLED displays have just some of the worst viewing angles I've ever seen out of any display, including cheap TN panels like those IBM and Lenovo liked to put into Thinkpads. Though apparently there is quite some sample variation to that... also tons of purple/green fringing but apparently that's considered normal for phone OLEDs.